Moleskine is fairly infamous in the fountain pen world for using paper in most of their products that's incredibly decremental. The V5 works I think because of how little ink it puts down, though I may be wrong. At this point, there are a couple things you can do: First of all, you could get a planner with better paper in it. Goulet has a good section with a lot of these. That, or you could get a Moleskine-compatible ink. If you want black, Noodler's Black will do the trick.